package com.t13;

/**
 * Created by xuyiwei on 2018/7/23.
 */
public class Stringmethod {
    public static void main(String[] args) {
        String s = "123456789";
        System.out.println(s.substring(1,2));
        s.concat("aaaa");
        System.out.println(s);
    }
}
